feat(FN-3637): establish canonical roadmap plugin ID and compatibility rout

Merged commits stabilize the Fusion roadmap plugin's identity and routing surface, establishing a canonical plugin ID and compatibility routes so the roadmap plugin integrates cleanly with the dashboard's plugin system. Added new roadmap-routes and roadmap-suggestions modules in the dashboard packag

Fusion-Task-Id: FN-3637

plugins/fusion-plugin-roadmap/src/roadmap-ordering.ts

@@ -0,0 +1,7 @@
+export {
+  normalizeRoadmapMilestoneOrder,
+  applyRoadmapMilestoneReorder,
+  normalizeRoadmapFeatureOrder,
+  applyRoadmapFeatureReorder,
+  moveRoadmapFeature,
+} from "./store/roadmap-ordering.js";